<?php

Original data:
===============
$result = array(
 '32' => 'Belgium',
 '31' => 'Holland,
 '44' => 'England',
 '39' => 'German',
);

how can i add on top of this to make it like following:

Expected data:
==============
$result = array(
 ''   => '',
 '32' => 'Belgium',
 '31' => 'Holland,
 '44' => 'England',
 '39' => 'German',
);


Tried and getting fail to make the expected data:
===================================================
**If i try array_merge it makes the keys with 0, 1, 2, 3, ... same for array_push,
etc.., so i lose the country codes.